Car struggles to Start / High-idle: Please Assist
Joined: Apr 2007
Posts: 2,273
Likes: 0
From: SoCal - 818/626
Car struggles to Start / High-idle: Please Assist
Hey guys,
A real quick summary of the car before I describe the issue:
2003 AT G35 Sedan
80k Miles
Mods: AEM Cold Air Intake | Plenum Spacer
Spark notes version of the problem in chronological order:
-Car started having problems starting. It would always start eventually if i let it crank long enough on the first attempt, and it usually started perfectly on second attempt
- It began dropping to really low idles when I was at a stop, and felt like it was going to stall
- between 3rd-4th gears the car would jerk and lurch a bit like it needed fuel
-got a check engine light with an error that read 'Random Misfire in Cylinder'
- Took it to the shop: Was told there was not enough fuel pressure and the fuel pump was bad so..
- Had fuel pump replaced
-Had spark plugs replaced just in case
-had the throttle body cleaned
-the shop could not successfully reset the idle air so I told them I would do it.
After all that, I still have the ignition issue (check engine light is on indicating high idle). Sometimes the car will struggle to start and will crank really hard, other times it will start right up on the first pass.
Also, the fuel pressure problem seems to have gone away but now the idle is too high. It's around 1k even after warm up.
I have tried the idle air re-learn but still didn't fix it. I have reset the ECU as well, which didn't fix it.
Any idea on what could be causing these two issues?
I appreciate the help guys. Thanks.
A real quick summary of the car before I describe the issue:
2003 AT G35 Sedan
80k Miles
Mods: AEM Cold Air Intake | Plenum Spacer
Spark notes version of the problem in chronological order:
-Car started having problems starting. It would always start eventually if i let it crank long enough on the first attempt, and it usually started perfectly on second attempt
- It began dropping to really low idles when I was at a stop, and felt like it was going to stall
- between 3rd-4th gears the car would jerk and lurch a bit like it needed fuel
-got a check engine light with an error that read 'Random Misfire in Cylinder'
- Took it to the shop: Was told there was not enough fuel pressure and the fuel pump was bad so..
- Had fuel pump replaced
-Had spark plugs replaced just in case
-had the throttle body cleaned
-the shop could not successfully reset the idle air so I told them I would do it.
After all that, I still have the ignition issue (check engine light is on indicating high idle). Sometimes the car will struggle to start and will crank really hard, other times it will start right up on the first pass.
Also, the fuel pressure problem seems to have gone away but now the idle is too high. It's around 1k even after warm up.
I have tried the idle air re-learn but still didn't fix it. I have reset the ECU as well, which didn't fix it.
Any idea on what could be causing these two issues?
I appreciate the help guys. Thanks.
Joined: Apr 2007
Posts: 2,273
Likes: 0
From: SoCal - 818/626
Any one have an idea?
I should also mention that when the car finally does start it shudders for a few seconds at low idle like it's about to die then idle jumps up to 1k and all seems well. Car runs perfectly otherwise.
I should also mention that when the car finally does start it shudders for a few seconds at low idle like it's about to die then idle jumps up to 1k and all seems well. Car runs perfectly otherwise.
Registered User
Joined: Jul 2013
Posts: 377
Likes: 22
From: York, PA
check for crank angle sensor codes, and coil codes.... you also cant do the relearn if you have a CEL light on... also replacing the fuel damper is a cheap check(~$70 i think) and it will need done at some point anyway
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